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Isamu Fujita was born in Tokyo, and studied Kōga-ryū Wada Ha (Kōga-ryū Ninjutsu) with his grandfather Fujita Shintazaemon, 13th Soke of the Kōga-ryū. He studied at Waseda and Meiji Universities, and after leaving school, worked at a newspaper company. He went on to study several other martial arts and was also noted as an author, researcher and collector of ancient scrolls. According to some references, "opinions are divided if he was a real ninja or a mere budō researcher."[2]

Fujita Seiko published Zukai Torinawajutsu showing hundreds of Hojōjutsu ties from many different schools, and several other texts on ninjutsu and martial arts. He died of cirrhosis of the liver at about the age of 68 and likely suffered from hereditary angioedema (which can preclude the practice of martial arts, although Fujita may have demonstrated the ability to overcome some disease symptoms).[3] His collection, the Fujita Seiko Bunko, is housed at Iga-Ueno Museum, Odawara Castle.[4]

In 1972, a big part of this book has been translated in French by Jacques Devêvre, and published by the editions « Judo international », with the title : « Les points vitaux secrets du corps humain » (« The secret vital points of the human body »), then re-published in 1998, by « Budo editions », with the title : « L’art ultime et sublime des points vitaux » (« The magnificent and ultimate art of the vital points ») (with commentaries by Henry Plée)